<?php 
class resizeimage  {  

    //图片类型  

    var $type;  

    //实际宽度  

    var $width;  

    //实际高度  

    var $height;  

    //改变后的宽度  

    var $resize_width;  

    //改变后的高度  

    var $resize_height;  

    //是否裁图  

    var $cut;  

    //源图象  

    var $srcimg;  

    //目标图象地址  

    var $dstimg;  

    //临时创建的图象  

    var $im;  

    function resizeimage($img, $wid, $hei,$c,$dstpath){  
        $this->srcimg = $img;  
        $this->resize_width = $wid;  
        $this->resize_height = $hei;  
        $this->cut = $c;  

        //图片的类型  
		$this->type = strtolower(substr(strrchr($this->srcimg,"."),1));  
        //初始化图象  
        $this->initi_img();  
        //目标图象地址  
        $this -> dst_img($dstpath);  
        $this->width = imagesx($this->im);  
        $this->height = imagesy($this->im);  
        //生成图象  
        $this->newimg();  
        ImageDestroy ($this->im);  
    }  

    function newimg(){  
		//改变后的图象的比例  
        $resize_ratio = ($this->resize_width)/($this->resize_height);  
        //实际图象的比例  
        $ratio = ($this->width)/($this->height);  
        if(($this->cut)=="1"){
			//裁图  
			if($ratio>=$resize_ratio){
			//高度优先  
			$newimg = imagecreatetruecolor($this->resize_width,$this->resize_height);  
			imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, $this->resize_width,$this->resize_height, (($this->height)*$resize_ratio), $this->height);  
			ImageJpeg ($newimg,$this->dstimg);  
			}
		   if($ratio<$resize_ratio){
			//宽度优先  
			$newimg = imagecreatetruecolor($this->resize_width,$this->resize_height);  
			imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, $this->resize_width, $this->resize_height, $this->width, (($this->width)/$resize_ratio));  
			ImageJpeg ($newimg,$this->dstimg);  
		   }  
       }  
        else{ 
			//不裁图  
			if($ratio>=$resize_ratio){  
				$newimg = imagecreatetruecolor($this->resize_width,($this->resize_width)/$ratio);  
				imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, $this->resize_width, ($this->resize_width)/$ratio, $this->width, $this->height);  
				ImageJpeg ($newimg,$this->dstimg);  
			}  
			if($ratio<$resize_ratio){  
			 $newimg = imagecreatetruecolor(($this->resize_height)*$ratio,$this->resize_height);  
			 imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, ($this->resize_height)*$ratio, $this->resize_height, $this->width, $this->height);  
			 ImageJpeg ($newimg,$this->dstimg);  
			}  
        }  
	}  

    //初始化图象  

    function initi_img(){  
        if($this->type=="jpg"){  
            $this->im = imagecreatefromjpeg($this->srcimg);  
        }  

        if($this->type=="gif"){  
            $this->im = imagecreatefromgif($this->srcimg);  
        }  

        if($this->type=="png"){  
            $this->im = imagecreatefrompng($this->srcimg);  
        }  
	} 

    //图象目标地址  
    function dst_img($dstpath){  
        $full_length  = strlen($this->srcimg);  
        $type_length  = strlen($this->type);  
        $name_length  = $full_length-$type_length;  
        $name         = substr($this->srcimg,0,$name_length-1);  
        $this->dstimg = $dstpath;  
    }

}

 

new resizeimage("1.jpg", "564", "497", "1","2.jpg");  

?>
